I'm running Big Sur and I noticed three things about Time Machine:
- if I format a drive as HFS+ and then I choose it for Time Machine, it gets automatically converted to APFS without asking;
- once a backup is completed, if I open it in Finder I can only see the data volume, as it skipped the system one;
- local snapshots seem to be available (I can see them via tmutil) but I cannot access them in Time Machine UI.
I would need to know if these things are "normal", please.